[thirdparty/systemd.git] / src / shared / local-addresses.c

/* SPDX-License-Identifier: LGPL-2.1-or-later */

#include "sd-netlink.h"

#include "alloc-util.h"
#include "local-addresses.h"
#include "macro.h"
#include "netlink-util.h"
#include "sort-util.h"

static int address_compare(const struct local_address *a, const struct local_address *b) {
        int r;

        /* Order lowest scope first, IPv4 before IPv6, lowest interface index first */

        if (a->family == AF_INET && b->family == AF_INET6)
                return -1;
        if (a->family == AF_INET6 && b->family == AF_INET)
                return 1;

        r = CMP(a->scope, b->scope);
        if (r != 0)
                return r;

        r = CMP(a->metric, b->metric);
        if (r != 0)
                return r;

        r = CMP(a->ifindex, b->ifindex);
        if (r != 0)
                return r;

        return memcmp(&a->address, &b->address, FAMILY_ADDRESS_SIZE(a->family));
}

int local_addresses(sd_netlink *context, int ifindex, int af, struct local_address **ret) {
        _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
        _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
        _cleanup_free_ struct local_address *list = NULL;
        size_t n_list = 0, n_allocated = 0;
        sd_netlink_message *m;
        int r;

        assert(ret);

        if (context)
                rtnl = sd_netlink_ref(context);
        else {
                r = sd_netlink_open(&rtnl);
                if (r < 0)
                        return r;
        }

        r = sd_rtnl_message_new_addr(rtnl, &req, RTM_GETADDR, 0, af);
        if (r < 0)
                return r;

        r = sd_netlink_call(rtnl, req, 0, &reply);
        if (r < 0)
                return r;

        for (m = reply; m; m = sd_netlink_message_next(m)) {
                struct local_address *a;
                unsigned char flags;
                uint16_t type;
                int ifi, family;

                r = sd_netlink_message_get_errno(m);
                if (r < 0)
                        return r;

                r = sd_netlink_message_get_type(m, &type);
                if (r < 0)
                        return r;
                if (type != RTM_NEWADDR)
                        continue;

                r = sd_rtnl_message_addr_get_ifindex(m, &ifi);
                if (r < 0)
                        return r;
                if (ifindex > 0 && ifi != ifindex)
                        continue;

                r = sd_rtnl_message_addr_get_family(m, &family);
                if (r < 0)
                        return r;
                if (af != AF_UNSPEC && af != family)
                        continue;

                r = sd_rtnl_message_addr_get_flags(m, &flags);
                if (r < 0)
                        return r;
                if (flags & IFA_F_DEPRECATED)
                        continue;

                if (!GREEDY_REALLOC0(list, n_allocated, n_list+1))
                        return -ENOMEM;

                a = list + n_list;

                r = sd_rtnl_message_addr_get_scope(m, &a->scope);
                if (r < 0)
                        return r;

                if (ifindex == 0 && IN_SET(a->scope, RT_SCOPE_HOST, RT_SCOPE_NOWHERE))
                        continue;

                switch (family) {

                case AF_INET:
                        r = sd_netlink_message_read_in_addr(m, IFA_LOCAL, &a->address.in);
                        if (r < 0) {
                                r = sd_netlink_message_read_in_addr(m, IFA_ADDRESS, &a->address.in);
                                if (r < 0)
                                        continue;
                        }
                        break;

                case AF_INET6:
                        r = sd_netlink_message_read_in6_addr(m, IFA_LOCAL, &a->address.in6);
                        if (r < 0) {
                                r = sd_netlink_message_read_in6_addr(m, IFA_ADDRESS, &a->address.in6);
                                if (r < 0)
                                        continue;
                        }
                        break;

                default:
                        continue;
                }

                a->ifindex = ifi;
                a->family = family;

                n_list++;
        };

        typesafe_qsort(list, n_list, address_compare);

        *ret = TAKE_PTR(list);

        return (int) n_list;
}

static int add_local_gateway(
                struct local_address **list,
                size_t *n_list,
                size_t *n_allocated,
                int af,
                int ifindex,
                uint32_t metric,
                const RouteVia *via) {

        assert(list);
        assert(n_list);
        assert(n_allocated);
        assert(via);

        if (af != AF_UNSPEC && af != via->family)
                return 0;

        if (!GREEDY_REALLOC(*list, *n_allocated, *n_list + 1))
                return -ENOMEM;

        (*list)[(*n_list)++] = (struct local_address) {
                .ifindex = ifindex,
                .metric = metric,
                .family = via->family,
                .address = via->address,
        };

        return 0;
}

int local_gateways(sd_netlink *context, int ifindex, int af, struct local_address **ret) {
        _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
        _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
        _cleanup_free_ struct local_address *list = NULL;
        size_t n_list = 0, n_allocated = 0;
        int r;

        assert(ret);

        if (context)
                rtnl = sd_netlink_ref(context);
        else {
                r = sd_netlink_open(&rtnl);
                if (r < 0)
                        return r;
        }

        r = sd_rtnl_message_new_route(rtnl, &req, RTM_GETROUTE, af, RTPROT_UNSPEC);
        if (r < 0)
                return r;

        r = sd_netlink_message_request_dump(req, true);
        if (r < 0)
                return r;

        r = sd_netlink_call(rtnl, req, 0, &reply);
        if (r < 0)
                return r;

        for (sd_netlink_message *m = reply; m; m = sd_netlink_message_next(m)) {
                _cleanup_ordered_set_free_free_ OrderedSet *multipath_routes = NULL;
                _cleanup_free_ void *rta_multipath = NULL;
                union in_addr_union gateway;
                uint16_t type;
                unsigned char dst_len, src_len, table;
                uint32_t ifi, metric = 0;
                size_t rta_len;
                int family;
                RouteVia via;

                r = sd_netlink_message_get_errno(m);
                if (r < 0)
                        return r;

                r = sd_netlink_message_get_type(m, &type);
                if (r < 0)
                        return r;
                if (type != RTM_NEWROUTE)
                        continue;

                /* We only care for default routes */
                r = sd_rtnl_message_route_get_dst_prefixlen(m, &dst_len);
                if (r < 0)
                        return r;
                if (dst_len != 0)
                        continue;

                r = sd_rtnl_message_route_get_src_prefixlen(m, &src_len);
                if (r < 0)
                        return r;
                if (src_len != 0)
                        continue;

                r = sd_rtnl_message_route_get_table(m, &table);
                if (r < 0)
                        return r;
                if (table != RT_TABLE_MAIN)
                        continue;

                r = sd_netlink_message_read_u32(m, RTA_PRIORITY, &metric);
                if (r < 0 && r != -ENODATA)
                        return r;

                r = sd_rtnl_message_route_get_family(m, &family);
                if (r < 0)
                        return r;
                if (!IN_SET(family, AF_INET, AF_INET6))
                        continue;

                r = sd_netlink_message_read_u32(m, RTA_OIF, &ifi);
                if (r < 0 && r != -ENODATA)
                        return r;
                if (r >= 0) {
                        if (ifi <= 0)
                                return -EINVAL;
                        if (ifindex > 0 && (int) ifi != ifindex)
                                continue;

                        r = netlink_message_read_in_addr_union(m, RTA_GATEWAY, family, &gateway);
                        if (r < 0 && r != -ENODATA)
                                return r;
                        if (r >= 0) {
                                via.family = family;
                                via.address = gateway;
                                r = add_local_gateway(&list, &n_list, &n_allocated, af, ifi, metric, &via);
                                if (r < 0)
                                        return r;

                                continue;
                        }

                        if (family != AF_INET)
                                continue;

                        r = sd_netlink_message_read(m, RTA_VIA, sizeof(via), &via);
                        if (r < 0 && r != -ENODATA)
                                return r;
                        if (r >= 0) {
                                r = add_local_gateway(&list, &n_list, &n_allocated, af, ifi, metric, &via);
                                if (r < 0)
                                        return r;

                                continue;
                        }
                }

                r = sd_netlink_message_read_data(m, RTA_MULTIPATH, &rta_len, &rta_multipath);
                if (r < 0 && r != -ENODATA)
                        return r;
                if (r >= 0) {
                        MultipathRoute *mr;

                        r = rtattr_read_nexthop(rta_multipath, rta_len, family, &multipath_routes);
                        if (r < 0)
                                return r;

                        ORDERED_SET_FOREACH(mr, multipath_routes) {
                                if (ifindex > 0 && mr->ifindex != ifindex)
                                        continue;

                                r = add_local_gateway(&list, &n_list, &n_allocated, af, ifi, metric, &mr->gateway);
                                if (r < 0)
                                        return r;
                        }
                }
        }

        typesafe_qsort(list, n_list, address_compare);

        *ret = TAKE_PTR(list);

        return (int) n_list;
}
Commit	Line	Data
db9ecf05	1	/* SPDX-License-Identifier: LGPL-2.1-or-later */
8041b5ba	2
1c4baffc	3	#include "sd-netlink.h"
b5efdb8a LP	4
b5efdb8a LP	5	#include "alloc-util.h"
e80af1bd	6	#include "local-addresses.h"
cf0fbc49 TA	7	#include "macro.h"
cf0fbc49 TA	8	#include "netlink-util.h"
760877e9	9	#include "sort-util.h"
8041b5ba	10
93bab288 YW	11	static int address_compare(const struct local_address a, const struct local_address b) {
93bab288 YW	12	int r;
5502f0d9 LP	13
	14	/* Order lowest scope first, IPv4 before IPv6, lowest interface index first */
	15
e9140aff LP	16	if (a->family == AF_INET && b->family == AF_INET6)
	17	return -1;
	18	if (a->family == AF_INET6 && b->family == AF_INET)
	19	return 1;
	20
93bab288 YW	21	r = CMP(a->scope, b->scope);
	22	if (r != 0)
	23	return r;
5502f0d9	24
93bab288 YW	25	r = CMP(a->metric, b->metric);
	26	if (r != 0)
	27	return r;
5502f0d9	28
93bab288 YW	29	r = CMP(a->ifindex, b->ifindex);
	30	if (r != 0)
	31	return r;
5502f0d9	32
00d75e57	33	return memcmp(&a->address, &b->address, FAMILY_ADDRESS_SIZE(a->family));
5502f0d9 LP	34	}
5502f0d9 LP	35
1c4baffc	36	int local_addresses(sd_netlink context, int ifindex, int af, struct local_address *ret) {
4afd3348 LP	37	_cleanup_(sd_netlink_message_unrefp) sd_netlink_message req = NULL, reply = NULL;
4afd3348 LP	38	_cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
e80af1bd	39	_cleanup_free_ struct local_address *list = NULL;
5502f0d9	40	size_t n_list = 0, n_allocated = 0;
1c4baffc	41	sd_netlink_message *m;
d1ca51b1	42	int r;
d73c3269	43
e80af1bd LP	44	assert(ret);
e80af1bd LP	45
ee8c4568	46	if (context)
1c4baffc	47	rtnl = sd_netlink_ref(context);
ee8c4568	48	else {
1c4baffc	49	r = sd_netlink_open(&rtnl);
ee8c4568 LP	50	if (r < 0)
	51	return r;
	52	}
8041b5ba	53
1d050e1e	54	r = sd_rtnl_message_new_addr(rtnl, &req, RTM_GETADDR, 0, af);
d1ca51b1 TG	55	if (r < 0)
d1ca51b1 TG	56	return r;
8041b5ba	57
1c4baffc	58	r = sd_netlink_call(rtnl, req, 0, &reply);
d1ca51b1 TG	59	if (r < 0)
d1ca51b1 TG	60	return r;
d1ca51b1	61
1c4baffc	62	for (m = reply; m; m = sd_netlink_message_next(m)) {
e80af1bd	63	struct local_address *a;
d1ca51b1	64	unsigned char flags;
5502f0d9	65	uint16_t type;
1d050e1e	66	int ifi, family;
d1ca51b1	67
1c4baffc	68	r = sd_netlink_message_get_errno(m);
d1ca51b1 TG	69	if (r < 0)
	70	return r;
	71
1c4baffc	72	r = sd_netlink_message_get_type(m, &type);
d1ca51b1 TG	73	if (r < 0)
d1ca51b1 TG	74	return r;
d1ca51b1	75	if (type != RTM_NEWADDR)
8041b5ba LP	76	continue;
8041b5ba LP	77
ee8c4568 LP	78	r = sd_rtnl_message_addr_get_ifindex(m, &ifi);
	79	if (r < 0)
	80	return r;
1d050e1e LP	81	if (ifindex > 0 && ifi != ifindex)
1d050e1e LP	82	continue;
ee8c4568	83
1d050e1e LP	84	r = sd_rtnl_message_addr_get_family(m, &family);
	85	if (r < 0)
	86	return r;
	87	if (af != AF_UNSPEC && af != family)
ee8c4568 LP	88	continue;
ee8c4568 LP	89
5502f0d9	90	r = sd_rtnl_message_addr_get_flags(m, &flags);
d1ca51b1 TG	91	if (r < 0)
d1ca51b1 TG	92	return r;
5502f0d9	93	if (flags & IFA_F_DEPRECATED)
d73c3269	94	continue;
8041b5ba	95
e9140aff	96	if (!GREEDY_REALLOC0(list, n_allocated, n_list+1))
5502f0d9 LP	97	return -ENOMEM;
	98
	99	a = list + n_list;
	100
	101	r = sd_rtnl_message_addr_get_scope(m, &a->scope);
d1ca51b1 TG	102	if (r < 0)
d1ca51b1 TG	103	return r;
8041b5ba	104
945c2931	105	if (ifindex == 0 && IN_SET(a->scope, RT_SCOPE_HOST, RT_SCOPE_NOWHERE))
d73c3269	106	continue;
8041b5ba	107
1d050e1e	108	switch (family) {
5502f0d9	109
d1ca51b1	110	case AF_INET:
1c4baffc	111	r = sd_netlink_message_read_in_addr(m, IFA_LOCAL, &a->address.in);
d1ca51b1	112	if (r < 0) {
1c4baffc	113	r = sd_netlink_message_read_in_addr(m, IFA_ADDRESS, &a->address.in);
d1ca51b1 TG	114	if (r < 0)
	115	continue;
	116	}
	117	break;
5502f0d9	118
d1ca51b1	119	case AF_INET6:
1c4baffc	120	r = sd_netlink_message_read_in6_addr(m, IFA_LOCAL, &a->address.in6);
d1ca51b1	121	if (r < 0) {
1c4baffc	122	r = sd_netlink_message_read_in6_addr(m, IFA_ADDRESS, &a->address.in6);
d1ca51b1 TG	123	if (r < 0)
	124	continue;
	125	}
	126	break;
5502f0d9	127
d1ca51b1	128	default:
d73c3269	129	continue;
d73c3269	130	}
8041b5ba	131
ee8c4568	132	a->ifindex = ifi;
1d050e1e	133	a->family = family;
8041b5ba	134
d1ca51b1	135	n_list++;
5502f0d9	136	};
8041b5ba	137
93bab288	138	typesafe_qsort(list, n_list, address_compare);
e9140aff	139
1cc6c93a	140	*ret = TAKE_PTR(list);
e9140aff LP	141
	142	return (int) n_list;
	143	}
	144
bff94a84 YW	145	static int add_local_gateway(
	146	struct local_address **list,
	147	size_t *n_list,
	148	size_t *n_allocated,
	149	int af,
	150	int ifindex,
	151	uint32_t metric,
	152	const RouteVia *via) {
	153
	154	assert(list);
	155	assert(n_list);
	156	assert(n_allocated);
	157	assert(via);
	158
	159	if (af != AF_UNSPEC && af != via->family)
	160	return 0;
	161
	162	if (!GREEDY_REALLOC(list, n_allocated, *n_list + 1))
	163	return -ENOMEM;
	164
	165	(list)[(n_list)++] = (struct local_address) {
	166	.ifindex = ifindex,
	167	.metric = metric,
	168	.family = via->family,
	169	.address = via->address,
	170	};
	171
	172	return 0;
	173	}
	174
1c4baffc	175	int local_gateways(sd_netlink context, int ifindex, int af, struct local_address *ret) {
4afd3348 LP	176	_cleanup_(sd_netlink_message_unrefp) sd_netlink_message req = NULL, reply = NULL;
4afd3348 LP	177	_cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
e9140aff	178	_cleanup_free_ struct local_address *list = NULL;
e9140aff LP	179	size_t n_list = 0, n_allocated = 0;
	180	int r;
	181
	182	assert(ret);
	183
	184	if (context)
1c4baffc	185	rtnl = sd_netlink_ref(context);
e9140aff	186	else {
1c4baffc	187	r = sd_netlink_open(&rtnl);
e9140aff LP	188	if (r < 0)
	189	return r;
	190	}
	191
1d050e1e	192	r = sd_rtnl_message_new_route(rtnl, &req, RTM_GETROUTE, af, RTPROT_UNSPEC);
e9140aff LP	193	if (r < 0)
	194	return r;
	195
1c4baffc	196	r = sd_netlink_message_request_dump(req, true);
e9140aff LP	197	if (r < 0)
	198	return r;
	199
1c4baffc	200	r = sd_netlink_call(rtnl, req, 0, &reply);
e9140aff LP	201	if (r < 0)
	202	return r;
	203
bff94a84 YW	204	for (sd_netlink_message *m = reply; m; m = sd_netlink_message_next(m)) {
	205	_cleanup_ordered_set_free_free_ OrderedSet *multipath_routes = NULL;
	206	_cleanup_free_ void *rta_multipath = NULL;
	207	union in_addr_union gateway;
e9140aff	208	uint16_t type;
d1b014df	209	unsigned char dst_len, src_len, table;
bff94a84 YW	210	uint32_t ifi, metric = 0;
bff94a84 YW	211	size_t rta_len;
1d050e1e	212	int family;
bff94a84	213	RouteVia via;
e9140aff	214
1c4baffc	215	r = sd_netlink_message_get_errno(m);
e9140aff LP	216	if (r < 0)
	217	return r;
	218
1c4baffc	219	r = sd_netlink_message_get_type(m, &type);
e9140aff LP	220	if (r < 0)
e9140aff LP	221	return r;
e9140aff LP	222	if (type != RTM_NEWROUTE)
	223	continue;
	224
a98433c0	225	/* We only care for default routes */
584d0d2a	226	r = sd_rtnl_message_route_get_dst_prefixlen(m, &dst_len);
e9140aff LP	227	if (r < 0)
e9140aff LP	228	return r;
e9140aff LP	229	if (dst_len != 0)
	230	continue;
	231
584d0d2a	232	r = sd_rtnl_message_route_get_src_prefixlen(m, &src_len);
a98433c0 LP	233	if (r < 0)
	234	return r;
	235	if (src_len != 0)
	236	continue;
	237
d1b014df LP	238	r = sd_rtnl_message_route_get_table(m, &table);
	239	if (r < 0)
	240	return r;
	241	if (table != RT_TABLE_MAIN)
	242	continue;
	243
bff94a84 YW	244	r = sd_netlink_message_read_u32(m, RTA_PRIORITY, &metric);
bff94a84 YW	245	if (r < 0 && r != -ENODATA)
e9140aff	246	return r;
e9140aff	247
1d050e1e LP	248	r = sd_rtnl_message_route_get_family(m, &family);
	249	if (r < 0)
	250	return r;
bff94a84	251	if (!IN_SET(family, AF_INET, AF_INET6))
1d050e1e LP	252	continue;
1d050e1e LP	253
bff94a84 YW	254	r = sd_netlink_message_read_u32(m, RTA_OIF, &ifi);
	255	if (r < 0 && r != -ENODATA)
	256	return r;
	257	if (r >= 0) {
	258	if (ifi <= 0)
	259	return -EINVAL;
	260	if (ifindex > 0 && (int) ifi != ifindex)
	261	continue;
e9140aff	262
bff94a84 YW	263	r = netlink_message_read_in_addr_union(m, RTA_GATEWAY, family, &gateway);
	264	if (r < 0 && r != -ENODATA)
	265	return r;
	266	if (r >= 0) {
	267	via.family = family;
	268	via.address = gateway;
	269	r = add_local_gateway(&list, &n_list, &n_allocated, af, ifi, metric, &via);
	270	if (r < 0)
	271	return r;
e9140aff	272
e9140aff	273	continue;
bff94a84	274	}
e9140aff	275
bff94a84	276	if (family != AF_INET)
e9140aff LP	277	continue;
e9140aff LP	278
bff94a84 YW	279	r = sd_netlink_message_read(m, RTA_VIA, sizeof(via), &via);
	280	if (r < 0 && r != -ENODATA)
	281	return r;
	282	if (r >= 0) {
	283	r = add_local_gateway(&list, &n_list, &n_allocated, af, ifi, metric, &via);
	284	if (r < 0)
	285	return r;
	286
	287	continue;
	288	}
e9140aff LP	289	}
e9140aff LP	290
bff94a84 YW	291	r = sd_netlink_message_read_data(m, RTA_MULTIPATH, &rta_len, &rta_multipath);
	292	if (r < 0 && r != -ENODATA)
	293	return r;
	294	if (r >= 0) {
	295	MultipathRoute *mr;
e9140aff	296
bff94a84 YW	297	r = rtattr_read_nexthop(rta_multipath, rta_len, family, &multipath_routes);
	298	if (r < 0)
	299	return r;
e9140aff	300
bff94a84 YW	301	ORDERED_SET_FOREACH(mr, multipath_routes) {
	302	if (ifindex > 0 && mr->ifindex != ifindex)
	303	continue;
	304
	305	r = add_local_gateway(&list, &n_list, &n_allocated, af, ifi, metric, &mr->gateway);
	306	if (r < 0)
	307	return r;
	308	}
	309	}
e9140aff LP	310	}
e9140aff LP	311
93bab288	312	typesafe_qsort(list, n_list, address_compare);
d73c3269	313
1cc6c93a	314	*ret = TAKE_PTR(list);
d73c3269	315
e80af1bd	316	return (int) n_list;
8041b5ba	317	}